Maria Konopnicka (Polish pronunciation: [ˈmarja kɔnɔpˈɲitska] ; née Wasiłowska; 23 May 1842 – 8 October 1910) was a Polish poet, novelist, children's writer, translator, journalist, critic, and activist for women's rights and for Polish independence. She used pseudonyms, including Jan Sawa. She was one of the most important poets of Poland's Positivist period.
Paul Gerhard Natorp (24 January 1854 – 17 August 1924) was a German philosopher and educationalist, considered one of the co-founders of the Marburg school of neo-Kantianism. He was known as an authority on Plato.
Eduard Gottlob Zeller (German: [ˈtsɛlɐ]; 22 January 1814, Kleinbottwar – 19 March 1908, Stuttgart) was a German philosopher and Protestant theologian of the Tübingen School of theology. He was well known for his writings on Ancient Greek philosophy, especially Pre-Socratic Philosophy, and most of all for his celebrated, multi-volume historical treatise The Philosophy of Greeks in their Historical Development (1844–52). Zeller was also a central figure in the revival of neo-Kantianism.